submicroscopic gold inclusions within sulphide minerals such as arsenopyrite and pyrite. such ores require a pre-treatment process to alter or destroy the sulphide matrix and render the gold accessible to cyanide and oxygen (gudyanga et al. 1999). the gold in high-sulphur and high-arsenic refractory gold concentrate (hgc) is encapsulated
effect of pretreatment of sulfide refractory concentrate with sodium hypochlorite followed by extraction of gold by pressure cyanidation on gold removal
refractory gold ore and pretreatment mining equipment … refractory gold ore pretreatment treatment of refractory gold ore (whole ore and flotation concentrates) has become more prominent since the 1980s with many gold discoveries often including ores that are wholly or partially refractory.
gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80% even after fine grinding. 1) arsenic-bearing refractory gold ore has stones extremely difficult to deal with. in the stones gold is locked up in arsenic mineral matrix as the form of microscopic or submicroscopic lattice.
a "refractory" gold ore is an ore that has ultra fine gold particles disseminated throughout its gold occluded minerals. these ores are naturally resistant to recovery by standard cyanidation and carbon adsorption processes. these refractory ores require pre-treatment in order for cyanidation to be effective in recovery of the gold.
this study assessed the capability of the fungus phanerochaete chrysosporium to decompose pyrite arsenopyrite and a sulfide-containing flotation concentrate in an effort to develop a microbial process for pretreating refractory gold ores.the extent of biotransformation was monitored by analyzing for iron sulfur and arsenic in incubation solutions and for sulfide sulfur in the residual solids.
many of the gold deposits contain finely disseminated gold in iron sulfide minerals such as pyrite and arsenopy- rite. such deposits are called refractory gold ores due to the encapsulation of fine particles of gold in the ore host. a clear boundary between refractory and non-refractory ore in terms of gold recovery is not well defined but